Question

give any five characteristic of chordata?

Answer 1

1. Single, hollow nerve cord beneath dorsal surface; in vertebrates, it differentiates into brain and spinal cord2. Notochord: flexible rod on the dorsal side of gut, present at one stage in all chordates; displaced in vertebrates by vertebral column that forms around the nerve cord3. Pharyngeal slits (pouches) connect pharynx (between mouth and esophagus) with outside ? gills in sharks, fish; present in terrestrial animal embryos but disappear later except Eustachian tube (connecting throat and middle ear)4. Postanal tail extends beyond anus; present at least in embryo; regresses into tail bone in humans5. Segmentation: reflected in arrangement of muscles (somites) and in vertebral column (both mesoderm

Answer 2

These characteristics are only present during embryonic development in some chordates.The notochord provides skeletal support, gives the phylum its name, and develops into the vertebral column in vertebrates.The dorsal hollow nerve cord develops into the central nervous system: the brain and spine.Pharyngeal slits are openings in the pharynx that develop into gill arches in bony fish and into the jaw and inner ear in terrestrial animals.The post-anal tail is a skeletal extension of the posterior end of the body, being absent in humans and apes, although present during embryonic development